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<p>The microstructure evolution in VT6 alloy during multiple forging and subsequent isothermal rolling at a temperature of 560&#xa0;°C is studied. The combined treatment resulted in the formation of an ultrafine-grained (UFG) structure in alloy which made it possible to implement the effect of low-temperature superplasticity (LTSP). The deformation relief formed on the gauge part of UFG samples at the stage of a steady-state LTSP flow is analyzed. It is established that LTSP at 650&#xa0;°C is carried out by cooperative grain-boundary sliding. UFG alloy was used to study the peculiarities of metal-matrix composite manufacturing according to the scheme “foil–fiber–foil” by pressing in the LTSP mode. Findings testify that selected and justified parameters of isostatic pressing of Ti-B composite under LTSP conditions provide excellent bonding of the matrix material layers smoothly filling the gaps between the fibers and forming reliable connection of the matrix and fibers.</p>

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Low-Temperature Superplasticity of Ultrafine-Grained VT6 Alloy

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Vladimir V. Astanin,
  • Ilnar A. Ramazanov,
  • Nariman A. Enikeev,
  • Elena V. Bobruk

摘要

The microstructure evolution in VT6 alloy during multiple forging and subsequent isothermal rolling at a temperature of 560 °C is studied. The combined treatment resulted in the formation of an ultrafine-grained (UFG) structure in alloy which made it possible to implement the effect of low-temperature superplasticity (LTSP). The deformation relief formed on the gauge part of UFG samples at the stage of a steady-state LTSP flow is analyzed. It is established that LTSP at 650 °C is carried out by cooperative grain-boundary sliding. UFG alloy was used to study the peculiarities of metal-matrix composite manufacturing according to the scheme “foil–fiber–foil” by pressing in the LTSP mode. Findings testify that selected and justified parameters of isostatic pressing of Ti-B composite under LTSP conditions provide excellent bonding of the matrix material layers smoothly filling the gaps between the fibers and forming reliable connection of the matrix and fibers.